Otto Deden (19/11/1925), a Dutch composer and choir conductor (born in Amsterdam). He studied with Hendrik Andriessen, Wouter Paap, Herman Strategier and Albert de Klerk and on the Rotterdam Conservatory. He composed over 150 compositions, profane and church music: 29 masses, a lot of motets, cantatas, oratoria, piano- and organ works and chamber music.